Wateristhecommonnameappliedtotheliquidform(state)ofthehydrogenandoxygencompoundH2O.Purewaterisanodorless,tasteless,clearliquid.Waterisoneofnature'smostimportantgiftsandkindofliquidgoldtomankind.Essentialtolife,aperson'ssurvivaldependsondrinkingwater.Wecan'tlivewithoutwater.Waterisoneofthemostessentialelementstogoodhealth--itisnecessaryforthedigestionandabsorbtionoffood;helpsmaintainpropermuscletone;suppliesoxygenandnutrientstothecells;ridsthebodyofwastes;andservesasanaturalairconditioningsystem.Healthofficialsemphasizetheimportanceofdrinkingatleasteightglassesofcleanwatereachandeverydaytomaintaingoodhealth. 　　Waterisakeycomponentindeterminingthequalityofourlives.Today,peopleareconcernedaboutthequalityofthewatertheydrink.Althoughwatercoversmorethan70%oftheEarth,only1%oftheEarth'swaterisavailableasasourceofdrinking.Yet,oursocietycontinuestocontaminatethispreciousresource.Waterisknownasanaturalsolvent.Beforeitreachestheconsumer'stap,itcomesintocontactwithmanydifferentsubstances,includingorganicandinorganicmatter,chemicals,andothercontaminants.Manypublicwatersystemstreatwaterwithchlorinetodestroydisease-producingcontaminantsthatmaybepresentinthewater.Althoughdisinfectionisanimportantstepinthetreatmentofpotablewater,thetasteandodorofchlorineisobjectionable.And,thedisinfectantsthatareusedtopreventdisease,cancreatebyproductswhichmayposesignificanthealthrisks.Today,drinkingwatertreatmentatthepoint-of-useisnolongeraluxury,itisanecessity!Consumersaretakingmattersintotheirownhandsandarenowdeterminingthequalityofthewatertheyandtheirfamilieswilldrinkbyinstallingadrinkingwatersystemthatwillgivethemclean,refreshing,andhealthierwater. 　　2 　　HerearesomeinterestingfactsaboutWhyWaterisImportant. 　　Waterisnecessarytoalllivingthings. 　　Waterisallaroundus,intheairandintheground.Itisinmilk,vegetables,fruit,meat,leaves,trunks,roots,andbranchesofatree;itiseveninstones. 　　Waterisusedformanythings: 　　Todrink:peopleshoulddrink8glassesofwatereachdaytostayhealthy. 　　Towashthings:dishes,cars,clothes,ourselvesasneeded. 　　Tocookthingsin(eggs,vegetables);touseinthingswecook(cakes,soup). 　　Toputoutfires. 　　Toplayin:pools,ponds,lakes,oceans;ortoplaywithwhenusinghoses,sprayers,orsprinklers. 　　Towaterplants,lawns,trees,bushes. 　　Totransportcargoandpeopleonshipsorboats. 　　Moreplantsandanimalsliveinwater(saltwaterorinfreshwater)thanonland. 　　Seventypercentoftheearthismadeupofwater.Hugebodiesofwatercanabsorbandstorelargeamountsofheatcomingfromthesunespeciallyduringdaytimeandthesummerseason.Duringthewinterandthenighttime,thegradualcoolingofwatercanwarmuptheair.Thispropertyofwaterhelpsstabilizethetemperatureoftheoceansthuscreatingafavorablehabitatformarinelife. 　　Becauseofwater鈥檚highspecificheat,itcankeeptheearth鈥檚fluctuationsintemperatureonlandoratseawithinlimitsthatisfavorableforlife.Sinceorganisms(animals,floralandfauna)aremadeupofwateraswell,theyaremorecapableofresistin